How to Use an Abacus: A Step-by-Step Guide

Beginner's Guide to Using an Abacus for Kids

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Usain Bolt vs Justin Gatlin: Track and Field Showdown

History of Abacus | What is Abacus? | Evolution of Abacus | World's First Calculating Device

"Abacus Explained : Origins, Benefits, and Basics"

Abacus Lesson 1 // Introduction, Proper Technique, & History of the Abacus // Tutorial